What are hte pooled tables

Hello,
I dont know what are the pooled tables in ABAP. Please any one help me to know this question.
I will be thankfull to all,
By
satish

Hi,
Here i am giving the definitions and differences between
different table types in SAP.
It gives you clear idea.
You can also go thru. below link
http://web.mit.edu/ist/org/admincomputing/dev/sap_table_types.htm
I. Transparent tables (BKPF, VBAK, VBAP, KNA1, COEP)
Allows secondary indexes (SE11->Display Table->Indexes)
Can be buffered (SE11->Display Table->technical settings) Heavily updated tables should not be buffered.
II. Pool Tables (match codes, look up tables)
Should be accessed via primary key or
Should be buffered (SE11->Display Table->technical settings)
No secondary indexes
Select * is Ok because all columns retrieved anyway
III. Cluster Tables (BSEG,BSEC)
Should be accessed via primary key - very fast retrieval otherwise very slow
No secondary indexes
Select * is Ok because all columns retrieved anyway. Performing an operation on multiple rows is more efficient than single row operations. Therefore you still want to select into an internal table. If many rows are being selected into the internal table, you might still like to retrieve specific columns to cut down on the memory required.
Statistical SQL functions (SUM, AVG, MIN, MAX, etc) not supported
Can not be buffered
IV. Buffered Tables (includes both Transparent & Pool Tables)
While buffering database tables in program memory (SELECT into internal table) is generally a good idea for performance, it is not always necessary. Some tables are already buffered in memory. These are mostly configuration tables. If a table is already buffered, then a select statement against it is very fast. To determine if a table is buffered, choose the 'technical settings' soft button from the data dictionary display of a table (SE12). Pool tables should all be buffered
Hope this clears your doubt.
Note: Please reward the points for helpful answers.
Regards,
Gopinath Addepalli

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>
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http://searchsap.techtarget.com/tip/1,289483,sid21_gci912390,00.html
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check this link also
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